Issue
- Concurrent user
- IIS limit
- Webstation user limit
- Simultaneous request execution limit
- Concurrent connection limit of 10
Environment
- TAC Vista
- Windows
- Webstation
- IIS
Cause
Many questions about webstation are how many concurrent user that can connect to the webserver, while the webserver itself do not have any limits except the license used
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0-008-8270-1 "Vista 5.1 Web station 1 CAL - One concurrent user license for Web station 5"
0-008-8271-1 "Vista 5.1 Web station 3 CAL - Three concurrent user licenses for Web station 5"
0-008-8272-1 "Vista 5.1 Web station 6 CAL- Six concurrent user licenses for Web station 5"
0-008-8273-1 "Vista 5.1 Web station 12 CAL- Twelve concurrent user licenses for Web station 5"
0-008-8274-1 "Vista 5.1 Web station Unlimited- License for unlimited users for Web station 5"
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The operating system and/or the IIS do have a limit, not on user connected but connection made to the application.
While using Windows XP this error occurs when 10 connections are met "403.9's (Access Forbidden: Too many users are connected Internet Information Services). "
This is not really handled by IIS but the TCPIP.SYS that is set to a limit of 10 connection.
Windows 7 (SP2) introduced a new way to handle the connection, so when the 10 connections are met, the following connections are queued so you will not see any error messages but it can take a while for the page to load. There is a timeout parameter in IIS.
Windows server edition's do not have any limits so always use a windows server for webserver.
NOTE: Webstation takes 1 connection and each TGML open takes 1 connection so if you use 1 webstation and have 5 TGML open you are already using 6 connection.
Resolution
Below is a list for the limits on respective Operating system
| Windows Server 2008 R2 (IIS v7.5) | ||
| Server: | Server OS = No Limits | |
| Windows 7 (IIS v7.5)2 | ||
| Starter: | No IIS | |
| Home Basic: | No IIS | |
| Home Premium: | simultaneous request execution limit of 3, allows multiple sites | |
| Business: | simultaneous request execution limit of 10, allows multiple sites | |
| Enterprise: | simultaneous request execution limit of 10, allows multiple sites | |
| Ultimate: | simultaneous request execution limit of 10, allows multiple sites | |
| Windows Server 2008 (IIS v7.0) | ||
| Server: | Server OS = No Limits | |
| Windows Vista (IIS v7.0)2 | ||
| Starter: | No IIS | |
| Home Basic: | No IIS | |
| Home Premium: | simultaneous request execution limit of 3, allows multiple sites | |
| Business: | simultaneous request execution limit of 10, allows multiple sites | |
| Enterprise: | simultaneous request execution limit of 10, allows multiple sites | |
| Ultimate: | simultaneous request execution limit of 10, allows multiple sites | |
| Windows 2003 (IIS v6.0) | ||
| Server: | Server OS = No Limits | |
| WHS: | Server OS = No Limits1 | |
| Windows XP (IIS v5.1) | ||
| Home: | No IIS | |
| Professional: | concurrent connection limit of 10, allows only one site | |
| Windows 2000 (IIS v5.0) | ||
| Professional: | concurrent connection limit of 10, allows only one site | |
| Server: | Server OS = No Limits | |
| Windows NT 4 w/ SP3 (IIS v4.0) | ||
| Workstation: | No IIS, PWS installs as part of the NT Option Pack | |
| Server: | Server OS = No Limits, IIS installs as part of the NT Option Pack |
